Belting



J1me 1934- E. A. GOETTER BELTING Filed Jan. 5. 1931 INVENTOR [pwfl/w f7. 6057752 ATTORNEY Patented June 26, 1934 PATENT OFFICE- puma EdwardA. Goetter, Chicago, n1., assignor to Fairbanks, Morse & 00., Chicago, 111., a corporation of Illinois Application January 5, 1931, Serial No. 506,595

2.0laims. (can-6s) This invention relates to improvements in belting, and more particularly to flexible beltin,, of.

the so-called- V type.

An object of the present invention is to provide an improved belting of the type noted, which possesses greater flexibility and driving strength than similar belts heretofore constructed.

A further object is to provide an improved flexible belt which includes means for cushioning 10 the flexing action of the cords of the belt, and

which insures less internal friction and heat within the belt when under load carrying conditions. An additional object is to provide an improved flexible V belt which possesses neatness and individuality in construction, and which is con-- structed at least in part, of a better and higher quality of rubber than used in the older prevailing types of belting.

Further objects .and advantages will appear from the following detailed description of parts and from the accompanying drawing, consisting of a prospective view, partially in section, of a preferred form of my improved belt construction.

It will of course be understood that the present etailed description of parts and the accompanying drawing relates to a single preferred executional embodiment of the invention and that substantial changes may be made in the described arrangement and construction without departing from the spirit and full intended scope of the invention.

Referring by numerals to the drawing, 10 designates generally, an improved form of belting of v type, usually constructed in endless form, and which, by preference, includes a plurality of length of the belting, and are embedded in vulcanized rubber 12, or a similar substance, My preference is to provide a plurality of rows of the breaker cords, which are laterally offset or staggered, relative to each other, and which are noncontiguous, being spaced by layers of rubber, cured in place about the cords. It is preferred to provide a small number of rows of the breaker cords, three superposed rows being illustrated as suitable for belting of the usual commercial sizes. Approximately at the center of the belting, or slightly below a longitudinal median, are provided a plurality of load-carrying cords 13 which are also embedded in vulcanized rubber 12. The cords 13 are shown as disposed in rows, four relatively staggered rows disposed in vertically spaced relation being preferred in belting of the usual sizes. The breaker cords are, by preference, disposed near the top of the belt, and a breaker cords 11, which extend throughout the cushion or pad 14 of white stock is disposed between the breaker cords at the top of the belt, and the load carrying cords, at or a little below the center of the belt. It will be apparent that the breaker and load carrying cords may, instead go of a plurality of these cords, be replaced by a coil or roll of fabric, or similar material. It will also be seen that substantially below the load carrying cords 13, a strip of vulcanized rubber is provided as forming the lowermost portion of 05 the body of the belting. i With further reference to the strip 14, this portion of the body of the belt is by preference formed of a zinc oxide stock, while the remainder' of the rubber stock employed in the body Y of the belt may consist of any of the suitable black rubber compounds available in the trade. The zinc. oxide cushion or strip 14, being compounded to include a pigment and flller having a relatively small ultimate particle size, produces an intermediate pad possessing a greater flexibility than the usual black rubber compounds, which may serve adequately as a vulcanizing medium for forming the remainder of the body of the belting. Disposed as it is, just so below the breaker cords, this cushion of zinc oxide rubber stock serves as a more flexible base below the breaker cords, serving also as a cushion above the load cords, and thus serves to promote the normal flexing action of these cords. The use of a zinc oxide pad or strip -at this point further has the advantage of providing a better quality rubber through a zone in the belt which is subjected to a great deal of flexing action, and in which, for this reason, it is desirable to minimize the internal friction. The zinc oxide compound thus results in a lower total internal heat in the belting, than is the case where the entire body of the belting is formed throughout of the usual darker colored stocks. By reason of its low internal heat and the fact that the white cushion extends-tripsversely of the belting from one side totheother thereof, this strip of coo rubber serves better, to radiate the internal heat as it is generated," and hence, for this reason, serves to keep the belt at a lower average temperature under given operating, conditions. In order still further to enhance the radiating effect of the zinc oxide strip 14, I prefer to form the lateral extremities of the strip substantially as shown, that is, to flare the ends outwardly toward the lateral faces of the belt, so that, considered transversely of the belt section, the cool strip is substantially of I shape. This arrangement further conduces up to a better union between the black and white stocks in the body of the belting.

The belting described is preshaped in molding to present sloping or downwardly converging sides 15, which abut a shorter bottom face 16 and a longer upper or outer face 1'7. The body of the belting, as thus far described, is by preference, wrapped in a layer of duck or canvas 18 which extends preferably along the bottom face 16 and sides 15. An outer wrapping or cover 19 encloses the entire structure, that is, the bottom 16, sides 15, andis lapped as at 20 on the top 17. It will be apparent that the entire assembly may then be vulcanized as a mass or unit into a product suitable for use.

It will be apparent that the outer covering of canvas or the like may be disposed with the warp threads obliquely disposed, as shown, in order to increase the frictional engagement of the belting with the side faces when working in the grooved channel portions of the pulleys over which the belt is operating. It will be seen that the described improved belting possesses a number of distinguishing qualities not provided by the so-called V type belting heretofore available to the trade, and attaining, among other advantages, the objects severally enumerated above.

I claim:

1. A vulcanized V type belting including a body of frusto-triangular section, containing a longitudinal strip extending over the full width of the body and along the neutral zone of the belting, said neutral strip being free of cords and formed of rubber compounded with a substantial percentage of a compounding ingredient of small particle size, resulting in a compound of relatively high thermal conductivity, high tensile strength and low internal friction; a layer of a different stock, above said neutral strip, a plurality of breaker cords disposed in spaced staggered relation and separately embedded within said upper layer; a layer of breaker cords below said neutral strip, individually embedded within a rubber compound similar to the upper layer, a cushion base, free uf cords and fabric, and disposed along the lowermost portion of the body of belting, projections above and below each lateral extremity of said neutral strip, such that this strip is of longitudinally hollowed or trough-like aspect, and laterally embraces the corded portions above and below it, the projections further constituting heat-radiating faces close to the lateral surfaces of the belting, and a wrapper enclosing and vulcanized to the body.

2. A V type belting including a body formed of vertically spaced layers of cords extending lon gitudinally of the belt, a rubber compound vulcanized about said cords, one of said corded layers being disposed along and adjacent the upper or outer surface of the body, and the other adjacent and below the neutral zone of the belting; a layer of compound occupying the neutral zone of the belting and containing a substantial proportion of zinc oxide, andbeing of a stock distinct from said first named compound, the zinc oxide layer being disposed transversely of the belt, and extending between said corded layers from one lateral face of the belt, to the opposite face, and provided with heat radiating, lateral enlargements just within the side faces of the body, the enlargements extending above and below the plane of the neutral layer which is thereby recessed or hollowed to receive the adjacent corded layers, said second compound characterized by lesser internal friction, under given load conditions, and a relatively higher thermal conductivity, than the cord-retaining compound; a base cushion layer free of cords and fabric, disposed below the lowermost corded layer, and a fabric enclosure extending about said beltingand lapped upon itself near the outer surface thereof, the threads of said fabric being disposed obliquely'to the longitudinal axis of the belting.

EDWARD A. GOE'I' IER. 

